Yes, I am going to die. But I plan my life on chances. If I currently have a 50% chance of living to 80 I'd only have a 49.5% chance if I smoked.
Subtract if I:
Drank regulary: 49%.
Did drugs: 47%.
Cut: 46.5%.
Robbed Banks:40%
Add if I:
Never drove: 56%
Ate healthily: 57%
Never drank: 58%
Worked out 59%
Thats just the way I look at it. I make choices based on how will it effect my longevity. Who are we but fleeting specks, flashes of existance to the universe? But if my flash is just a little bit longer, a few more brief moments, then I will have accomplished something.
Well, after reading that, I would laugh if you got hit by a car. (No offense meant, I just would.)
Every day can be the last. You can't really calculate how long you could possibly live if you do this and that.
You never drank, you never drove, you always do sports, but still, you never made it to your 80s because of that plance crash you died in at 30. Or the sudden explosion of a chemical plant in your region that gave you cancer. And still that other guy who always smoked and drank and never did sports lives till he is 85, just because he was a bit more lucky than you.
You can't really prolong your life, other than totally isolating you from everything that has even a 0,001% possibility of killing you. Just live and enjoy the moment.